Intricate glasswork -[ HMM ]-

Anode end of a xenon-arc lamp (a slightly larger version of the one shown here) from a 16mm projector, showing its electrode seal. Since the tungsten electrode, the strip of conductive foil for the lead wire, and the quartz envelope expand and contract at different rates as the lamp heats and cools, multiple layers of different types of glass are used between the the electrode and the quartz body to contain the high gas pressure and prevent explosions under normal operation.

Done